valvespring suggestions for XFI cam?
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valvespring suggestions for XFI cam? Decided to go with the 07-467-8 Comp XFI cam (.580 or so lift, very aggressive ramps). Heads will be off, getting freshened up, so can have spring seats cut to accept whatever. Given that, suggestions as to best spring choice? I'm really liking the lift capability of PRC or PAtriot Gold springs, especially at the price including titanium retainers. Comp wants me to use their 918 beehives, open to ALL suggestions, but leaning hard towards a dual spring for peace of mind.
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Originally Posted by Boodyrider
Decided to go with the 07-467-8 Comp XFI cam (.580 or so lift, very aggressive ramps). Heads will be off, getting freshened up, so can have spring seats cut to accept whatever. Given that, suggestions as to best spring choice? I'm really liking the lift capability of PRC or PAtriot Gold springs, especially at the price including titanium retainers. Comp wants me to use their 918 beehives, open to ALL suggestions, but leaning hard towards a dual spring for peace of mind.
https://ls1tech.com/forums/lt1-lt4-modifications/569638-anyone-running-big-xfi-cam-lt1.html
Boody, you seem to want affirmation of your choices, not advice from folks who have been there before or do it for a living. That happens a lot in this business. More's the pity.
Hope it works.
My understanding is the XFI lobes were developed specifically to take advantage of the capabilities of the beehive springs. I am sure you can make a standard spring work but are going to need a good bit more pressure to do so and pressure is wear on the valvetrain.
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Old SStroker I think he did follow your advice to some extent or maybe it was Brets. Anyways if I'm reading the numbers correctly he bought the 230 degree XFI cam not the 242 degree cam he was originally thinking of.
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From: Baltimore, Maryland
1) went with the XFI 230/236.
2) I'd probably have bought a cam from Joe Overton instead, if he had responded to the 4 messages or 2 emails I sent him.
3) I had little feedback from anyone except a single member who really liked their even bigger XFI cam.
As for springs... Patriot does in fact make an LT1 version of the duals, and the price was great. Will they do as well as beehives? Guess I'll find out.
By choice, would I have gone with an all-forged 383, ported heads, and a milder cam? Sure. But I had a max budget of under a grand, including slipping a used shortblock (no cost for that) into the car, and wanted a bit more fun out of it. I'll still probably pop the budget... but there was no way on earth to go 383, heads and cam. If you got to fix the car with the crispy short block (I did, it can't just sit forever), may as well add a bit, but that doesn't mean it'll be possible to do everything you might like to.
I did spring for a bit more porting on the heads... and Ladd's Porting ought to know their stuff after 40+ years. I'm confident Larry will get me what's possible from stock LT1 heads, and I'm positive the car will be even more fun than it was before the last oil pump seized, killing the oil pump, cam, dist gear, and ultimately short block.
(Oh, that was all likely due to the crappy job Performance Pontiac GMC in Ellicott City, Maryland did when they did the labor on a complete Jasper reman a while back. Seems they banged the pickup tube on the ground, causing a total failure much later. Goes along with them flipping the engine onto the valve covers to remove the oil pan. Guess that particular dealership didn't own an engine stand, or at least didn't think one was needed for a $5000 motor job)
In any case, I appreciated all the advice I got in this thread and others... even that advice I didn't take.
2) I'd probably have bought a cam from Joe Overton instead, if he had responded to the 4 messages or 2 emails I sent him.
3) I had little feedback from anyone except a single member who really liked their even bigger XFI cam.
As for springs... Patriot does in fact make an LT1 version of the duals, and the price was great. Will they do as well as beehives? Guess I'll find out.
By choice, would I have gone with an all-forged 383, ported heads, and a milder cam? Sure. But I had a max budget of under a grand, including slipping a used shortblock (no cost for that) into the car, and wanted a bit more fun out of it. I'll still probably pop the budget... but there was no way on earth to go 383, heads and cam. If you got to fix the car with the crispy short block (I did, it can't just sit forever), may as well add a bit, but that doesn't mean it'll be possible to do everything you might like to.
I did spring for a bit more porting on the heads... and Ladd's Porting ought to know their stuff after 40+ years. I'm confident Larry will get me what's possible from stock LT1 heads, and I'm positive the car will be even more fun than it was before the last oil pump seized, killing the oil pump, cam, dist gear, and ultimately short block.
(Oh, that was all likely due to the crappy job Performance Pontiac GMC in Ellicott City, Maryland did when they did the labor on a complete Jasper reman a while back. Seems they banged the pickup tube on the ground, causing a total failure much later. Goes along with them flipping the engine onto the valve covers to remove the oil pan. Guess that particular dealership didn't own an engine stand, or at least didn't think one was needed for a $5000 motor job)
In any case, I appreciated all the advice I got in this thread and others... even that advice I didn't take.
Originally Posted by 96capricemgr
Bret, correct me if I am wrong but beehives are have become a favorite for most LT1 heads shops.
I hope so, I probably started that band wagon a few years ago and it has paid off well for everyone.
Bret
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Originally Posted by SStrokerAce
Comp recomends the beehives for a reason.
Bret
Bret
Is i worth it to swap them for beehives?
