Which Cathedral Head is best?
Edelbrock made the dr head. They cast alot of heads for companies.
Thr tfs head isnt the best ls7 head. Thats purely subjective. They are great heads but there are much better out there.
Thr tfs head isnt the best ls7 head. Thats purely subjective. They are great heads but there are much better out there.
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Here's a head you won't see people talk about, a old friend showed me this one yrs ago....HighSpeed...canted valve Ls3 heads ....my thought when I 1st seen it was to raise the runner like a Ls7 head. Damned as Eric Roycroft did another idea I had yrs ago....only thing I didn't like was the lower lying runner and I got Ls3 Heads. It was a thought when I made Rowdy also, they don't sell the head as cast..
https://www.edelbrock.com/victor-jr-...ock-61339.html
I say this if you got a good porter you can make Anything work or go fast.. 5.3 heads on a 346 running 10's think about it. May have 9's but you guys catch the point.
https://www.edelbrock.com/victor-jr-...ock-61339.html
I say this if you got a good porter you can make Anything work or go fast.. 5.3 heads on a 346 running 10's think about it. May have 9's but you guys catch the point.
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Ask yourself is the Mast Head worth 20 HP and maybe 20 ftlbs vs a ported factory Ls3 head. Cost for the 20 HP is close to 4½ rather a 5k swap. The price hasn't changed much since Tim/87Hatchback told me the same thing about 4 yrs ago. And Tim had a 454 Hydraulic roller e85 build with ported Ls3 heads and Mast 4500 intake. 770ish HP & 9.3 et in a Mustang. Tim never switched.
Head swap will Not do as much as a bigger engine....same $ spent on a small bore head would or could buy a Bigger motor....You trying to buy heads for HP is good but ....the question you should ask yourself what is my goal...other wise your like a dog chasing it's tail. 750 and 800 were mine and knew 400 & 8 cubic inches could do both and be streetable.
Head swap will Not do as much as a bigger engine....same $ spent on a small bore head would or could buy a Bigger motor....You trying to buy heads for HP is good but ....the question you should ask yourself what is my goal...other wise your like a dog chasing it's tail. 750 and 800 were mine and knew 400 & 8 cubic inches could do both and be streetable.
Last edited by Smokey B; Jan 20, 2020 at 07:46 AM.
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700 .... To 750 isn't much....hell you got 700 now....you just don't know it. 750 is hard with the plastic but 700 is easy money.... We have Speedtrigger 402 and we need to make up the intake HP difference... That's 700 right? You have more compression✓ Cam < and all the little stuff ... There's not much you can change... Intake is the only restriction... Remember I got basically the same engine as you. 250ish cam and a 408 generally nets 730 to 750 HP with a 4 inch stroke and 402 or larger than 4 inch bore.
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Basic way to 700 to 750 with 11+ compression and a 4 inch bore and stroke.
Wrote it twice for a reason... ^
Solid roller time as Tuskey said.
A 454 or 430+ ci would do or could do this with with ease & plastic intake. How do I know? TSP 454 made 750 with a factory plastic intake and Hydraulic roller.
Wrote it twice for a reason... ^
Solid roller time as Tuskey said.
A 454 or 430+ ci would do or could do this with with ease & plastic intake. How do I know? TSP 454 made 750 with a factory plastic intake and Hydraulic roller.
Last edited by Smokey B; Jan 20, 2020 at 08:11 AM.
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700 .... To 750 isn't much....hell you got 700 now....you just don't know it. 750 is hard with the plastic but 700 is easy money.... We have Speedtrigger 402 and we need to make up the intake HP difference... That's 700 right? You have more compression✓ Cam < and all the little stuff ... There's not much you can change... Intake is the only restriction... Remember I got basically the same engine as you. 250ish cam and a 408 generally nets 730 to 750 HP with a 4 inch stroke and 402 or larger than 4 inch bore.
what rpm are you revving the engine out to?
Next engine will be an LS7 spec at 427cid with a 4.125 inch bore.
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https://sdparts.com/i-24104146-races...ce-engine.html
Ok ER and I both said as close as you can get
With Flyin and his 416 the 1st go round with a hydraulic.
LS2 based 403" 13.5:1 to run on E85
Frankenstein Racing Heads stage 1 LS3 heads
299/212@.400
363/236@.600
371/247@.900
Super Vic port matched to heads. No plenum work
Mark Whintner prepped BLP LilBo
SRD spec'ed hydraulic roller 248/268 .684/.667 112+5
PAC 1207x
Smith Bro's pushrods
Lunati's version of the Morel 5206
Comp Ultra Pro Magnum rockers, bolt down version
2" to 3.5" merge collector ARH headers
https://www.yellowbullet.com/threads.../post-52347546
Ok ER and I both said as close as you can get
With Flyin and his 416 the 1st go round with a hydraulic.
LS2 based 403" 13.5:1 to run on E85
Frankenstein Racing Heads stage 1 LS3 heads
299/212@.400
363/236@.600
371/247@.900
Super Vic port matched to heads. No plenum work
Mark Whintner prepped BLP LilBo
SRD spec'ed hydraulic roller 248/268 .684/.667 112+5
PAC 1207x
Smith Bro's pushrods
Lunati's version of the Morel 5206
Comp Ultra Pro Magnum rockers, bolt down version
2" to 3.5" merge collector ARH headers
https://www.yellowbullet.com/threads.../post-52347546
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My Max is around 7500.. I'd just work out having a plastic intake with more compression and or cam for 700.
Only difference in Speeds or Flying is one has more compression and the other has a SR vs the higher compression hydraulic roller...no major HP difference
https://www.enginelabs.com/engine-te...ild-with-ffre/
Only difference in Speeds or Flying is one has more compression and the other has a SR vs the higher compression hydraulic roller...no major HP difference
https://www.enginelabs.com/engine-te...ild-with-ffre/
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My favorite thing to do is spec engines using others references.......saves me $. I know what was done how can I improve what was seen. Reason I make friends with any Build I like.... Sometimes they don't give out spec's but a friend will. Or just call everyone or there engine builder on a good build... Did that also... Skip the engine owner🤫🤬😁
Last edited by Smokey B; Jan 20, 2020 at 09:00 AM.
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This is the block I'm looking at:
http://www.lsxperformanceparts.com.a...re-9-240-deck/
What you think?
http://www.lsxperformanceparts.com.a...re-9-240-deck/
What you think?