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View Full Version : Which V4 heads are best?


Riverman
03-15-2007, 07:38 AM
Hi, first post here on another great looking board!

I am currently assembling a river hot rod/mild drag V4 Johnny on a restored Viper. This is the first outboard I have put together. I currently have a set of 135 heads which I understand are no good for pump gas. I believe I have secured a set of 115 heads as well but I don't know their condition yet. This should be fine for break in.

My question is, which heads are best for cutting to obtain a good, high premium gas compression for everyday use?

Thanks in advance,
Jeff Couch

http://i3.photobucket.com/albums/y66/river_57/Viper%20finished/DSC01673.jpg
tthibodaux
03-15-2007, 09:46 AM
Nice ride...:D
Riverman
03-15-2007, 10:46 AM
It's not really a ride yet, all the riding I have done so far has been in the garage making motor noises. Thanks for the compliment though.
Water here is still in the solid state, but spring is comin'!

Here (http://forums.screamandfly.com/forums/showthread.php?t=79203) is the thread of the restoration process if you want to have a look.
tthibodaux
03-15-2007, 02:08 PM
It's not really a ride yet, all the riding I have done so far has been in the garage making motor noises. Thanks for the compliment though.
Water here is still in the solid state, but spring is comin'!

Here (http://forums.screamandfly.com/forums/showthread.php?t=79203) is the thread of the restoration process if you want to have a look.cyl. heads. part #317848/317849 1973 heads. You will need to make a bracket for the coils. 77-79 not as tight but good for what you want to do.
tthibodaux
03-15-2007, 02:34 PM
Very important... Before you even start to rig that thing get you some solid motor mounts. As light as it will be keeping it balanced on the pad will be almost impossible with the old rubber ones. The motor cannot have any slack or movement at all or you'll fight non stop to keep control.

Just a thought.:D
Riverman
03-15-2007, 03:25 PM
Got the solid mounts in the mid already.

The heads I have are 77 heads by part number, but I was told they were cut.
tthibodaux
03-15-2007, 03:37 PM
Got the solid mounts in the mid already.

The heads I have are 77 heads by part number, but I was told they were cut.I won't run pump gas if the comp is over about 150lbs with those heads.