Head mods, LT4 Cam in a 305
10-15-2007, 11:20 PM
#1
Member
Thread Starter
Join Date: Apr 2006
Location: Bardstown, KY
Posts: 216
Likes: 0
Received 0 Likes
on
0 Posts
Car: 99 HOSS 6 Speed
Engine: LS1
Transmission: T56
Axle/Gears: 3.42
Head mods, LT4 Cam in a 305
I have been working on my 081 casting 305 heads (for my boat). Machined down stud bosses and tapped for screw in studs, cut down the top of the valve guides for more lift, gasket matched, and, ported the S**T out them. Also did a 5 angle valve job and unshrouded the valves.
Does anyone know if you need to mod the pushrod holes in the heads or not? I am waiting on a set of 1.6 roller rockers, so I havent been able to check. If I do then I might just drill them all the way out and run guide plates.
Does anyone know if you need to mod the pushrod holes in the heads or not? I am waiting on a set of 1.6 roller rockers, so I havent been able to check. If I do then I might just drill them all the way out and run guide plates.
10-15-2007, 11:25 PM
#2
Re: Head mods, LT4 Cam in a 305
i dont think i've heard of anyone haveing pushrod hole problems. guideplates tho are fairly cheap and work ok, so its a safe bet.
i've seen many hotcams and other cams with 1.6 rockers and not seen a problem with pushrod holes/clearances
i've seen many hotcams and other cams with 1.6 rockers and not seen a problem with pushrod holes/clearances
10-15-2007, 11:27 PM
#3
Supreme Member
iTrader: (2)
Join Date: Jan 2005
Location: Hurst, Texas
Posts: 10,037
Received 394 Likes
on
336 Posts
Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Re: Head mods, LT4 Cam in a 305
Mine fit fine. I have heard of others having to drill though. Date code on my heads indicated december 1989. LT4 cam and 1.6:1 roller rockers
10-17-2007, 08:48 PM
#4
Member
Thread Starter
Join Date: Apr 2006
Location: Bardstown, KY
Posts: 216
Likes: 0
Received 0 Likes
on
0 Posts
Car: 99 HOSS 6 Speed
Engine: LS1
Transmission: T56
Axle/Gears: 3.42
Re: Head mods, LT4 Cam in a 305
What did you do to get your factory steel valve covers to go on? The rockers I bought have really wide bodys and are hitting the steel braces inside the covers. Did you have to trim those out?
10-17-2007, 08:52 PM
#5
Supreme Member
iTrader: (7)
Join Date: Aug 2005
Location: Ohio, near columbus
Posts: 1,068
Likes: 0
Received 1 Like
on
1 Post
Car: 89 iroc-z
Engine: 305tpi
Transmission: wc-t5
Axle/Gears: 10 bolt 3.08 posi (4 now)
Re: Head mods, LT4 Cam in a 305
yah u need eier narrow bodied rockers, or some cutting and grinding, most are against cutting them up but, idone it with no problems.
06-14-2012, 07:45 AM
#6
Junior Member
Join Date: Jun 2012
Location: Florida
Posts: 7
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1991 Chevy camaro rs
Engine: Chevy 305
Transmission: 700r4
Axle/Gears: 28 spline axle, 2.73
Re: Head mods, LT4 Cam in a 305
What do you think of a ramjet 305 with an lt4 cam, 059 or 520 casting heads? 1.5 or 1.6 rockers?
Last edited by Ramjet 305; 06-14-2012 at 07:47 AM. Reason: Forgot to mention the rocker arms
Thread
Thread Starter
Forum
Replies
Last Post
84z96L31vortec
Tech / General Engine
7
08-20-2017 12:16 AM
1988iroc350tpi
Tech / General Engine
8
08-14-2015 07:52 PM
84z96L31vortec
North East Region
1
08-10-2015 08:27 PM
