hi rev 302's

[cobra20sc]

Ok, who's running 6500-7000 RPM redlines on 302's with the stock hydraulic lifters and how are you doing it (cam, pushrods, valve springs, other)? My current combo (TFS stage1 cam, AFR185's box stock valve springs) wants to keep making power past 6000RPM but not sure if it'll go to 6500 without valve float, though I suppose I never tried.

-Chris

I spoke to one particular said expert on hi rev windsors already but that was as much fun as stabbing myself in the eye.

 

[Timspony]

....I use to shift my stock block 302 at 6800 RPM's!! (Few times I hit as high as 7200 RPM's) ....Never really a problem for me until a lifer broke!

 

[cobra20sc]

what cam and valve springs did you have? like i said, i've never pulled much past 6K but everyone talks about valve float . . .is it just big hooplah?

 

[Michael B]

Did a small solid flat tappet 306 launched at 4800 and shifted at 6800. still running with stock roller in my Ranger. as long as everything is set up right rpm is not an issue.

 

[cobra20sc]

Did a small solid flat tappet 306 launched at 4800 and shifted at 6800. still running with stock roller in my Ranger. as long as everything is set up right rpm is not an issue.

ok, you lost me. i was asking about hydraulic lifter setups (further to that roller). are you saying your ranger with the stock roller/hydraulic set is revving to 6800rpm?

 

[TERROR]

tfs stage 1 cam isnt too big, call afr with the part # for the heads and find the specs on the springs. with the right springs you can bring it to 6500 no problem.

 

[Michael B]

no stock efi fuel shut off is 6250. do your homework and spec the parts to work together. spring rates have to match cam profile to sustain rpm. yes you could wing a stock roller to 65 or 6800 but it would float like a mother.

 

[EHA Racing]

no stock efi fuel shut off is 6250. do your homework and spec the parts to work together. spring rates have to match cam profile to sustain rpm. yes you could wing a stock roller to 65 or 6800 but it would float like a mother.

Couldn't have said it better, If you want to spin it that high get the right parts. Also, the Stage 1 cam is not designed to rev that high but with the right springs and supporting mods you can do it.
My $.02 is to get a cam and valve springs matched to spin that high and a set of Comp Cams 851-16 roller lifters. I hate comp cams but they are one of the only companies that make a decent hyd. roller lifter for a sbf.
Oh, valve float is not hoopla. It's a real condition that usually ends in castrophic failure.

 

[EHA Racing]

I want to add one more thing.
Most of the $ we spend on our engine is in the cam and valvetrain. That is the heart of soul of your engine and when they don't work together correctly you are losing tons of performance.
Be happy that your lifters aren't $750, your rockers aren't $900 and your valve springs aren't $500 LOL. Our custom billet cams get up around $500.

 

[TBapp3]

Damn..big money spender!!

 

[Michael B]

If you want to play you have to pay. Make sure to have the rotating assembly balanced to live at that kind of rpm. nothing like seeing a motor shake itself apart.

 

[Timspony]

what cam and valve springs did you have? like i said, i've never pulled much past 6K but everyone talks about valve float . . .is it just big hooplah?

I had a special blower grin Comp Cam custom set-up by Jimmy LaRocca back in the day! ...It was not a high lift cam, I don't have the specs, but I will look tonight!

Back in the day, 1998-2000, I used a SVO RPM extender to bypass the stock Rev Limiter & also for the A/F Ratios...

 

[cobra20sc]

Thanks everyone.

So far I've filled out the Comp Cams recommendation and got a suggestion for a cam that is a solid roller cam . . .even though I stated I wanted to stay with a hydraulic roller, maybe they started their partying early and drank too much egg nogg? Anderson Ford Motorsports said their N61 or N71 with their High Rev springs will do the trick but I was kind of put off by their condescending attitude, not sure why tech support needs to take that approach.

I am using the tweecer to move the rev limiter out of the way (among other things) so that's not an issue.

Anyone else have any suggestions on who to go to for some more recommendations? I was hoping to keep the TFS stage 1 cam so as not to have to pull a head off to check piston to valve clearance. . . .and like I said, the dyno run seems to show potential on my current combo to continue to make much more power past 6K . . .though I'm really looking to spin the motor to get through the traps still in 4th gear.

-Chris

 

[Timspony]

Chris, what rear gears you running?

 

[cobra20sc]

4.10's . I need the gearing to make up for the low 2.66 1st gear ratio of the viper spec t56 in order to get off the line. the final first gear ratio is equivalent to a stock t5 with 3.27 gears . . . ouch! and the motor certainly does not make the off idle torque of an 03 cobra o a v10. in two words, a "bad purchase" for the quarter mile

 

[Timspony]

...I hear you with the 1st gear! ...Should OK with the 4.10's at the 1/4 mile, worst case, just get a little taller tire if you're running out of rear in 4th!

 

[dmustang]

Hey Chris I could have a copy of my set up built for you. It will handle anything you can throw at it!

 

[cobra20sc]

if I had your kind of money Dan, I'd do it for sure!

 

[EHA Racing]

The reason comp cams is suggesting a solid roller is because they don't recommend 7K with a hyd. roller. Plus they use the cheap SADI cast iron cores that flex like crazy over 6,500.
My 1st cam designer suggestion would be Jay Allen at Camshaft Innovations. He is a little tough for the thin skinned to deal with but he is the best, and he is very busy right now.
From there I would recommend Panhandle Performance and Bullet Cams.