Old 454 Crate Motor Specs Question

[64nailhead]

They also eat rollers, but my intent is roller as the block is all set up for it.

The lack of zinc in the oil hit them 1st and worst - my opinion of course. I'm glad to hear that's your plan. Now you're talking about an easy real 500hp yeeeeeeeeeeeeeah!!

 

[Supercharged111]

This guy looks like a decent candidate.

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[565bbchevy]

They also eat rollers, but my intent is roller as the block is all set up for it.

I have only had that issue with non pressurized solid roller lifters, never had an issue with pressure fed.

 

[Supercharged111]

I have only had that issue with non pressurized solid roller lifters, never had an issue with pressure fed.

Admittedly I was referring to the production engines, but that was due to soft cams.

 

[64nailhead]

This guy looks like a decent candidate.

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Not to me. The Thumper line was developed for noise and appearance. That cam with those specs should be a nitrous cam with all of the added duration on the exhaust side, but instead they set it up with an ICL that should be for a launching at 5000 rpms and an LSA to match. 'Comp Thumper' - all noise and no go. Something with an ICL in the 106 range and LSA in around 110. No more than 8 degrees of split duration to the exhaust side and duration less than 240 for both if you want it it be street friendly. If you want it to thump, then install a manual choke and yank it when you want to hear it.

Basically, pick a cam that works with your compression and short block - don't pick something that can make 650HP when your short block will give up the ghost at 500. If you couldn't tell, I hate the Thumper series.

If I sound like I know something about cams, then I want to correct you - I don't. If you can spare the extra $50-75 for a cam, the contact someone that does - Chris Straub, Mark at Bullet Cam, Cam Motion, etc. There is waaaaay more to a cam than duration, lift, ICL and LSA.

I'm off my soap box lol (probably fell off)

 

[Supercharged111]

I missed the LSA, that does seem like it'd add some rumpity rump without doing anything useful. I thought the split was large, but that there may have been a reason as the GM crate 454HO has a large split as well.

 

[bracketchev1221]

Just go with the crate 502/502hp cam and lifter setup.

 

[Supercharged111]

Just go with the crate 502/502hp cam and lifter setup.

Pretty mild looking, no LSA specified.

Camshaft Lift (in.): .527 intake / .544 exhaust
Camshaft Duration (@.050 in.): 224° intake / 234° exhaust

Not bad though, and carries power about to where I want. I wonder if I can find any dynos on GenVI heads with the ski jumps knocked out.

 

[565bbchevy]

Pretty mild looking, no LSA specified.

Camshaft Lift (in.): .527 intake / .544 exhaust
Camshaft Duration (@.050 in.): 224° intake / 234° exhaust

Not bad though, and carries power about to where I want. I wonder if I can find any dynos on GenVI heads with the ski jumps knocked out.

Just remember it will act bigger in a 454 compared to a 502,

 

[bracketchev1221]

Pretty mild looking, no LSA specified.

Camshaft Lift (in.): .527 intake / .544 exhaust
Camshaft Duration (@.050 in.): 224° intake / 234° exhaust

Not bad though, and carries power about to where I want. I wonder if I can find any dynos on GenVI heads with the ski jumps knocked out.

110 lsa