Anyone running 295/65/15 DR's?

[69 GTX]

I agree with the guys above. Also it may be easier to get hooked up with the taller tire, with more sidewall with the 3.91s. Strokers tend to be torque monsters so use it to your advantage.

 

[496BEE]

Ok, I'm gonna hold off on the 4.30s and see what happens with 3.91s and extra height . I just don't want my 60' to go to **** . . . Also a good point was brought up, I always thought I was making power till 6500 then signed off because of the hydraulic roller. Maybe it's signing off sooner and I should try shifting at like 6200

I agree with the guys above. Also it may be easier to get hooked up with the taller tire, with more sidewall with the 3.91s. Strokers tend to be torque monsters so use it to your advantage.

 

[69 GTX]

Here is my dyno sheet. 440 Trick flow heads, 6 bbl .030 9.9:1 Cam very close to yours only a 112 LSA. Now to be fair the 112 will bring the peak power down a little, but I knew the intake would probably be the restriction point. You can see that even though peak HP is at 5900 it starts to flat line at 5600. So I'm going to start with a 5800 shift point. We ran it to 6500 once and it never got better than at 58-5900. You will also note the torque starts falling off at 56-5700. This combo made 591 hp 560 ft lb tq. Can't wait to get it on the road.

 

[496BEE]

Nice numbers ! I wouldn't have thought the redline was that low . Your graph looks great though ... how do you think your 440 compares to my 496 as far as rpm graph?

View attachment 411151
Here is my dyno sheet. 440 Trick flow heads, 6 bbl .030 9.9:1 Cam very close to yours only a 112 LSA. Now to be fair the 112 will bring the peak power down a little, but I knew the intake would probably be the restriction point. You can see that even though peak HP is at 5900 it starts to flat line at 5600. So I'm going to start with a 5800 shift point. We ran it to 6500 once and it never got better than at 58-5900. You will also note the torque starts falling off at 56-5700. This combo made 591 hp 560 ft lb tq. Can't wait to get it on the road.

 

[496BEE]

Strange because mine seems to rev faster than my 440 did due to the pistons being so light . But also it's a long stroke with long rods so I guess the peak power is made lower down

 

[69 GTX]

Hard to say as every engine is different. Mine has a roller top end so it is capable of 7000 rpm but just doesn't make any power there. I would think it would be close but that's just a guess. I would guess yours to have at least 50-100 more ft lbs of torque though. Due to bigger cu in.

 

[dvw]

Most 727 's 1/2 shift take about 400-500 rpm to shift accounting for driver reaction. 2/3 shift around 300-400 rpm. I've verified this on 3 different cars (727) with replay tach or data logger.
Doug

 

[cdr]

Strange because mine seems to rev faster than my 440 did due to the pistons being so light . But also it's a long stroke with long rods so I guess the peak power is made lower down

I WOULD GUESS your peak HP is about 5600, maybe a little more.

 

[Tex013]

here is my experience for what it is worth .
With my old 440 I went from a 3.91 to a 4.1 gear was worth nearly a tenth , 3-400rpm
With my current 505 I normally run a 28x10.5 pro bracket radial . Last month I tried the 295/65R15 et street SS . The 60 was identical but et and mph were down a little . I just felt it wasn't pulling hard enough with the taller tyre , was only 61-6200rpm instead of 65-6600
Those SS are flat heavy about 12lbs each over the pro brackets . Also they hit the dogleg when I backed off at finish line

Tex

 

[65 3 times]

I have found this tool to be very effective when fitting tire and wheel combos.
http://www.rimsntires.com/specspro.jsp Dave

 

[Budnicks]

Larger & taller tire = larger footprint
I like the most tire I can get & with no rubbing {after alterations}

some guys like to run the shorter tires
some guys fly with the 275's Drag Radials

I had really bad luck with too much wheel-speed,
no matter what psi I had/tried,
I couldn't make them work as well as the taller wider tires
I had too much initial spin on
275/60/15's, 28.25" tall, 11.25" wide, 9.75" tread
on 9" rims {but some people go really fast on 275's}

I went to M/T ET 315/60'/15, 29.5" tall, 12.5" wide, 11.5" tread
{bigger footprint, more rollout, my car liked it}
on 10" rims on my last/old 68 RR,
reworked 175k MP 3800 stall, it'd flash to 4200
cross the line at 6300-6400rpm 4.10:1
{& later 3.91:1 about a 300 rpm drop}
taller gears were more street friendly, especially with that taller tire too
(I had 4.30's org. too much gear for the combo/car/cam/converter)

That car with the same 479ci low deck 4.15" stroker would run best
9.77 @ 135 N/A 3520#'s with me in it, ran it's best with that tire combo
Sacramento raceway 100* test & tune, no track prep
high 1.30's 60' on Caltracs & some new 3.73:1 gears
on the now pretty much wore out 315/60's
{it ran best 8.58 @ 156 on N20, same tires, 1.24 IIRC 60'}


depends on what the car & engine wants
how well you can get the weight to transfer etc.

 

[496BEE]

A lot of good info. So you agree the taller tire and keeping the same gear will probably be good for my combo?

Larger & taller tire = larger footprint
I like the most tire I can get & with no rubbing {after alterations}

some guys like to run the shorter tires
some guys fly with the 275's Drag Radials

I had really bad luck with too much wheel-speed,
no matter what psi I had/tried,
I couldn't make them work as well as the taller wider tires
I had too much initial spin on
275/60/15's, 28.25" tall, 11.25" wide, 9.75" tread
on 9" rims {but some people go really fast on 275's}

I went to M/T ET 315/60'/15, 29.5" tall, 12.5" wide, 11.5" tread
{bigger footprint, more rollout, my car liked it}
on 10" rims on my last/old 68 RR,
reworked 175k MP 3800 stall, it'd flash to 4200
cross the line at 6300-6400rpm 4.10:1
{& later 3.91:1 about a 300 rpm drop}
taller gears were more street friendly, especially with that taller tire too
(I had 4.30's org. too much gear for the combo/car/cam/converter)

That car with the same 479ci low deck 4.15" stroker would run best
9.77 @ 135 N/A 3520#'s with me in it, ran it's best with that tire combo
Sacramento raceway 100* test & tune, no track prep
high 1.30's 60' on Caltracs & some new 3.73:1 gears
on the now pretty much wore out 315/60's
{it ran best 8.58 @ 156 on N20, same tires, 1.24 IIRC 60'}


depends on what the car & engine wants
how well you can get the weight to transfer etc.

 

[Budnicks]

A lot of good info. So you agree the taller tire and keeping the same gear will probably be good for my combo?

Yes, for the most part...
It worked for me, on several of these types of builds...