Summit heads what are thes comparable to?

[tranz am]

Im thinking about buying these heads for use with an 87 TPI fuel injection set up. But before I do I want some opinions. I did some research already and found that these heads are actually made by Brodix IK's. But the question is how well do they perform?
Um running a gen I 350 with flat top pistons.



http://store.summitracing.com/partde...5&autoview=sku

[monte0185]

They would work good for a TPI setup. I'm going with the 210cc ones from jegs. Little bit pricier but their for a built 383. Or at least will be anyway.

[tranz am]

Im thinking on stroking mine too actually.
210cc intake runners, man those are a lot bigger then these summit ones.
How much were your heads? I bet they arnt for 87+ intakes are they?

Originally Posted by monte0185

They would work good for a TPI setup. I'm going with the 210cc ones from jegs. Little bit pricier but their for a built 383. Or at least will be anyway.

[monte0185]

Heres a link. I havent ordered them yet but they are the ones im going with. Their the 215cc ones. I was mistaken. They are the best for the money that i have found. I already have all my block work done. I started with a 99 model vortec and added 6" h-beam rods and a forged crank. I havent ordered my pistons yet cause im toying with the idea of running dual turbo's. If i do ill be running about 8.5-1 pistons if not ill be running about 10.5-1 pistons and a bottle. Everyone i have talked to said you cant hardly build an engine that the 215cc runners will not handle.

http://www.jegs.com/i/JEGS/555/51423/10002/-1

[tranz am]

looks great but I wonder if it would hinder low rpm power being so large? will the TPI manifold even bolt up to it? You said vortech heads. do they still retain the off set center bolt holes for the intake?

[monte0185]

Vortec is just the block. Its the same as a standard block other than it has a one piece rear main and its a factory roller motor. These heads will fit a TPI manifold if you drill out the center 4 holes to match the standard head configuration. But to be honest if you looking into building horsepower your gonna be dissapointed with TPI. You want to go up a couple years and use an lt1 style injection if your looking to build horsepower. TPI is great for an everyday driver but not for a horsepower application.

[smoky02]

Just to clarify. Or maybe I'm confused and someone call straighten me out. Vortec isn't the block it's the heads. A vortec motor (L31) is a factory roller block with the vortec heads on the motor. And like Monte said, they are some of the best heads that chevy made. And if you want real HP, check out the fast burn. They are an aluminum setup of the vortec heads with more cam clearance. And edelbrock does make a vortec substitute head that is aluminum and I'm thinking of picking a set up for my truck so i can run a larger cam, but the problem that I'm running into is the TPI won't support my cam is what I'm being told. Even with the upgraded rails and runners.

[tranz am]

there is a book out there called the "chevy tpi fuel injection swappers guide" that goes into great detail about custom aftermarket tpi stuff to get higher hp and or flow out of a tpi system. A reburned chip should solve the problem.


here is a set of large intake runners for example

Originally Posted by smoky02

Just to clarify. Or maybe I'm confused and someone call straighten me out. Vortec isn't the block it's the heads. A vortec motor (L31) is a factory roller block with the vortec heads on the motor. And like Monte said, they are some of the best heads that chevy made. And if you want real HP, check out the fast burn. They are an aluminum setup of the vortec heads with more cam clearance. And edelbrock does make a vortec substitute head that is aluminum and I'm thinking of picking a set up for my truck so i can run a larger cam, but the problem that I'm running into is the TPI won't support my cam is what I'm being told. Even with the upgraded rails and runners.

[monte0185]

Originally Posted by smoky02

Just to clarify. Or maybe I'm confused and someone call straighten me out. Vortec isn't the block it's the heads. A vortec motor (L31) is a factory roller block with the vortec heads on the motor. And like Monte said, they are some of the best heads that chevy made. And if you want real HP, check out the fast burn. They are an aluminum setup of the vortec heads with more cam clearance. And edelbrock does make a vortec substitute head that is aluminum and I'm thinking of picking a set up for my truck so i can run a larger cam, but the problem that I'm running into is the TPI won't support my cam is what I'm being told. Even with the upgraded rails and runners.

Im not sure where i got L98 from. I meant L31. Sorry bout that. What can I say im getting old. I'm thinking that the vortec was named such cause of the roller block. The later model vortec 96-up had a different bolt pattern on the heads and flowed better as well.

[smoky02]

The vortec and the LT1's are very similar, but the LT1's water flow is the opposite of the vortec. And if you use the vortec heads you have to get a converter plate (edelbrock) sells it. And I have been told that the vortec heads actually open the higher RPM's up since the reason the original TPI's fall off is due to the restrictive heads.

[monte0185]

Originally Posted by smoky02

The vortec and the LT1's are very similar, but the LT1's water flow is the opposite of the vortec. And if you use the vortec heads you have to get a converter plate (edelbrock) sells it. And I have been told that the vortec heads actually open the higher RPM's up since the reason the original TPI's fall off is due to the restrictive heads.

Sorry meant LS1. Thanks for straightening me out. Id swear Ive almost forgot my brain recently. I had an LT1 that came out of a vette and was gonna build it till I seen all the things required and it just wasnt worth it to me. sold it for like 250$ i think.

[tranz am]

so let me get this right. you can bolt on an Ls1 head onto a gen I block?

Originally Posted by monte0185

Sorry meant LS1. Thanks for straightening me out. Id swear Ive almost forgot my brain recently. I had an LT1 that came out of a vette and was gonna build it till I seen all the things required and it just wasnt worth it to me. sold it for like 250$ i think.

[monte0185]

Nope sorry if i didnt specify. The LS1 style is the new 4.8, 5.3, 5.7, and 6.0 These are a completely different critter than any of the previous engines GM came up with. Something you might want to do is look up the history of the Chevy Small block. There are several different generations and it might give you some clarification on which is which and what is compatible. I could try to explain them all but theres not enough room on this site!! LMAO. sorry theres just that many variations.

[tranz am]

yea thats what I thought, just checking. So your talking about the LT1 stuff then Im guessing. now Im really confused with all the miss printing. Lets Clarify this
So what years are the vortec heads made?
So what was the difference between the Lt1 and Vortec?
what years was the LT1 made?
So I have to use a Vortec style intake manifold with the heads unless I use an adapter plate?

Originally Posted by monte0185

Nope sorry if i didnt specify. The LS1 style is the new 4.8, 5.3, 5.7, and 6.0 These are a completely different critter than any of the previous engines GM came up with. Something you might want to do is look up the history of the Chevy Small block. There are several different generations and it might give you some clarification on which is which and what is compatible. I could try to explain them all but theres not enough room on this site!! LMAO. sorry theres just that many variations.

[smoky02]

TPI was 85-91
LT1 was 92-96 I believe
LS1 was 96-present
L31 is a truck motor, first debuted in 1996. They made 305 and 350. The heads installed on a 305 don't flow as well as the 350 heads

[monte0185]

Originally Posted by smoky02

TPI was 85-91
LT1 was 92-96 I believe
LS1 was 96-present
L31 is a truck motor, first debuted in 1996. They made 305 and 350. The heads installed on a 305 don't flow as well as the 350 heads

Thanks!! I figured i was wrong on the dates.

['72customdeluxe]

The lt1 also ran to '97 in f-bodies and maybe began in '91 vettes

[Adambomb606]

Keep it simple

[Longhorn 70]

There was also an LT4 engine that produced a bit more horses than the LT1 from the factory. It was only 96-97 in Vettes with manual transmissions in 96. 97s may have been available with an auto. Basically the LT4 was the same as LT1 with better heads, intake and camshaft.

My LT4 has bigger cam, extrude honed heads and manifold, roller rockers, 6" rods and stroked to 3.875. It has no problem hitting the 6800 RPM rev limiter right now. It pulls HARD from 1500-6300. Plus they are purdy.