Have any of you used the stock Aluminum Intake for your L-69 Build-up?


I'm doing a mild build on a 87 L-69 for a 2700lb kit car (non-computer controled).

I'm using a 214/224 .442"/.465" Cam, Sanderson CC2 Headers, stock 58cc heads with .010 shave, .025 head gaskets and Peformer 600 Carb. Car is an Auto with a 3.31 Final Drive Ratio. Compression will be just slightly over the stock 9.5:1

Recently, I've been speaking with people who have retained the stock intake with pretty decent results on their 305's.

Just looking for some input from some people who have rebuilt their L-69's and used the stock intake. (since I'm not looking for "tremendous" HP gains for this project, I'd retain the stock intake if I could.

 

I ran a 14.8 @ 93 in a van with a 305 and stock cast iorn intake and manifolds. That was with a Q-jet too.

 

Sure, there is nothing wrong with the stock L69 intake, it is almost the equivelent of an Edelbrock Performer.

You could switch to Performer RPM but they often have trouble fitting under the hood.

 

Thanks Sitting Bull.


I was speaking to a few guys who retained the stock intake and felt the same way. Unlike some of the older cast iron intakes, the L-69 Aluminum intake does'nt appear to be that "bad".

Like you, Quite a few people have said that the difference between a Performer and the stock L-69 intake is minimal. Seeing how I can't fit the Performer RPM (engine is in the rear of the car and there is not enough clearance for the Performer RPM), the Performer or the stock intake are really my only options.

 

Sorry, but not with that carb. The factory intake is a 4-hole design directly underneath of the carb and it's only designed to match up with the tiny primaries and huge secondaries of the factory QJet carb. You need something that's just 2 big open kidney-shaped holes under the carb- like the Edlebrock Performer or similar aftermarket dual plane intake.

Edlebrock has a new version of the Performer out call the Performer EPS that I've started hearing good things about- more power everywhere than a stock intake- even at extreme low RPMs. It's got better runners than the older Performer. They took some of the flow technology from the excellent Performer RPM and threw it at the low-boy Performer EPS. I bet that intake would work real well for what you're trying to do.

 

I would, (of course) switch over to a Q-jet or the Holley 4175 spreadbore I have here if I retain the stock intake.

 

Also a edelbrock performer RPM with a TBI-carb intake adapter and a GM TBI assembly is shorter than a production carb intake with a carb.

 

There's something wrong with that statement. No L69's in '87. LG4, yes.

(And LG4 & L69 used the same intake manifold, for US cars, anyway.)

 

Nothing really "wrong" with the statement. But I can see the "confusion".

The 87 L-69 is from my last Monte SS not a F-body. The only engine available for the 4th Generation Monte Carlo SS was the L69 HO 305. (VIN - G)

Also , some (quite a few actually) LG4's used cast iron intakes not Aluminum. Just wanted to clarify. I don't think I mentiond that the engine was from a F-body but could see where someone could assumme that being that I'm posting on the Thirdgen board. (More people on this board so better responses than on some of the Monte Boards).

Thanks for the tips guys.

 

The LG4 aluminum intake statement was referencing f-bodies as well. Canadian non-computer LG4's got cast iron, but all US-delivered 3rd gen LG4's had aluminum intakes.

 

Good to know about the intakes on the LG4.

I've only had Big Blocks for many years now, but building the SBC is a nice little project.

(It's just "so cute" sitting on the stand compared to the Olds 455''s and Chevy 427's I'm used to....). In fact, my wife came down to the garage and asked me "what happend"?? Why is that one so small?? (Always hate to hear that from women.....).