best top end
Thread Starter
Junior Member
Joined: May 2017
Posts: 13
Likes: 0
From: Port henry Ny
Car: 86 iroc-z
Engine: 305
Transmission: 700 r4
Axle/Gears: Stock
best top end
I have a 305 in my iroc and im looking to do a top end build in it . Im just looking for suggestions on top end kits . Heads ,cams , intakes etc. Something with a medium/heavy cam ? What do you guys have and suggest ?
Supreme Member
Joined: Aug 2002
Posts: 1,160
Likes: 40
From: ARIZONA
Car: 92 Trans Am Conv
Engine: LB9
Transmission: T5
Axle/Gears: 3.08
Re: best top end
Pretty limited with the small bore.
Do you have a manual or auto?
What gears?
What exhaust?
Are you planning on swapping them or anything else?
What are your goals?
What do you plan to use the car for?
Do you have a manual or auto?
What gears?
What exhaust?
Are you planning on swapping them or anything else?
What are your goals?
What do you plan to use the car for?
Senior Member
Joined: May 2001
Posts: 698
Likes: 1
From: Houston TX
Car: 84 Z-28 Camaro, 2022 2500 silverado
Engine: 383
Transmission: T-56
Axle/Gears: richmond 3.73, eaton posi
Re: best top end
Your limited on most aftermarket heads bc of the small bore, 1.94/1.50 is the biggest you can go and from what I've heard some of those will even hit the cylinder walls, plus most aftermarket heads are in the 64cc range and the stock heads are in the 55 cc range so you compression will be significantly less...just things to take into consideration when working with a 305
Joined: Feb 2017
Posts: 4,174
Likes: 569
From: Meriden, CT 06451
Car: 84 TA orig. 305 LG4 "H" E4ME
Engine: 334 SBC - stroked 305 M4ME Q-Jet
Transmission: upgraded 700R4 3200 stall
Axle/Gears: 10bolt 4.10 Posi w Lakewood TA Bars